Samuel l



(No Model.)

S. L. HILL.

STEAM BOILER.

No. 250,146. v Patented Nov. 29,1881.

WITNESSES INVENTOR v ATTORNEYS.

. UNITED STATES PATENT OFFICE.

SAMUEL L. HILL, OF BROOKLYN, NEW YORK.

STEAM BOILER.

SPECIFICATION forming part of Letters Patent No. 250,146, dated November 29, 1881,

(No model.)

To all whom it may concern Be it known that I, SAMUEL L. HILL, of Brooklyn, in the county of Kings and State of New York, have invented a new and Improved Steam-Boiler, of which the following is a specification.

The object of my invention is to increase the heating-surface of a steam-boiler.

In the accompanying drawings, Figure 1 is a longitudinal sectional elevation of my improved boiler on the line 00 at, Fig. 2. Fig. 2 is a cross-sectional elevation of the same on the line 3 y, Fig. 1. Fig. 3 is a plan view of the end of the same, showing the arrangement of the feed-water pipes.

Similar letters of reference indicate corre-' spondin g parts.

The horizontal cylindrical boiler A is supported by two longitudinal water-boxes, B B, formed of sheet metal,the sides of these boxes being riveted to the shell of the boiler, as shown. The shell of the boiler has longitudinal rows of apertures O in the height of the tops of the boxes, for the purpose of permitting the steam to pass from the water-boxes into the boiler. Thewater-boxesB B are united throughout their en tire length by a series of transverse water-tubes, D, arranged in one or more horizontallayers, as maybe desired. These watertubes are arranged as near as possible to the lowest point of the boiler-shell, and, they are separated vertically about one-ha f of an inch and horizontally a distance equal to their diameter.

The grate E is below these water-tubes, as shown in Fig.1. The water-boxes B B are provided with proper stays and bolts F to give them the required strength and durability. The feed-water pipe G branches off into the pipe H for the boiler proper, A, and into the pipes J J for the boxes B B, which thus receive their water-supply from the feed-pipe direct.

If the feed-pipes did not deliver the water directly into the boxes, it might happen that the water-level in the boiler drops below the apertures G; the water in the boxes would be evaporated, and as no fresh supply could enter the boxes, the same would soon be destroyed, or the boiler would explode. The steam generated in the water-boxes does not enter the lower part of the shell, but enters at the water-line, thereby preventing foaming of the water in the boiler. The intense heat of the flames is broken by the transverse tubes under the shell, whereby the shell is not as liable to be blistered as the shell of an ordinary boiler. The sediment is blown off through separate pipes H H from the boxes, and through a suitable blow-oft pipe from the boiler proper. The sediment is all collected in the bottom of the boxes, and can be blown off through the pipes H very easily.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent In steam-boilers, the water-boxes B B, united their entire length by water-tubes l), in combination with the pipes H J and feed-water pipe G, whereby the boxes B receivatheir water directly from the Water-supply, so that the water-level in the boiler can never drop below the tubes 0 and allow that in the boxes to be evaporated, as set forth.

SAMUEL-L. HILL.

Witnesses:

OSCAR F. GUNZ, O. SEDGwIoK. 

